Diffusion of an acid dye in nylon—in relation to sorption and diffusion of a gas in glassy polymers

The steady-state permeation rate data of an acid dye in a nylon film were analyzed via dual-mode sorption and mobility model based on gradients of concentration. The model used incorporates diffusion in a porelike region, unlike diffusion of a gas in a glassy polymer. There was some possibilities of the Nernst to the Langmuir mode diffusion jump, and the diffusivity was estimated.